Remove Older Version While Insatlling a new version of Application

Question

I have a windows Application.Now I have made a installer to install my application in the other systems.Its working fine,but when I am seeing the Control Panel>Add/Remove Program there I can see more than one Application installed with the same name.I think ,I am not able to remove the older version of my previously installed application and its also residing in the Programs Files with my newly installed application , and it can create more problems in future.So how can I remove the older version of my previously installed application automatically when trying to install a newer version of the application ???? Help me.Thanks in advance.